source: src/GenPoly/FindFunction.cc@ 68db00e

//
// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// FindFunction.cc --
//
// Author           : Richard C. Bilson
// Created On       : Mon May 18 07:44:20 2015
// Last Modified By : Andrew Beach
// Last Modified On : Fri Oct  7 17:05:20 2022
// Update Count     : 7
//

#include "FindFunction.h"

#include <utility>                      // for pair

#include "AST/Pass.hpp"                 // for Pass
#include "AST/Type.hpp"
#include "Common/PassVisitor.h"         // for PassVisitor
#include "GenPoly/ErasableScopedMap.h"  // for ErasableScopedMap<>::iterator
#include "GenPoly/GenPoly.h"            // for TyVarMap
#include "ScrubTyVars.h"                // for ScrubTyVars
#include "SynTree/Declaration.h"        // for DeclarationWithType, TypeDecl
#include "SynTree/Mutator.h"            // for Mutator, mutateAll
#include "SynTree/Type.h"               // for FunctionType, Type, Type::For...

namespace GenPoly {
        class FindFunction : public WithGuards, public WithVisitorRef<FindFunction>, public WithShortCircuiting {
          public:
                FindFunction( std::list< FunctionType const* > &functions, const TyVarMap &tyVars, bool replaceMode, FindFunctionPredicate predicate );

                void premutate( FunctionType * functionType );
                Type * postmutate( FunctionType * functionType );
                void premutate( PointerType * pointerType );
          private:
                void handleForall( const Type::ForallList &forall );

                std::list< FunctionType const * > & functions;
                TyVarMap tyVars;
                bool replaceMode;
                FindFunctionPredicate predicate;
        };

        void findFunction( Type *type, std::list< FunctionType const * > &functions, const TyVarMap &tyVars, FindFunctionPredicate predicate ) {
                PassVisitor<FindFunction> finder( functions, tyVars, false, predicate );
                type->acceptMutator( finder );
        }

        void findAndReplaceFunction( Type *&type, std::list< FunctionType const * > &functions, const TyVarMap &tyVars, FindFunctionPredicate predicate ) {
                PassVisitor<FindFunction> finder( functions, tyVars, true, predicate );
                type = type->acceptMutator( finder );
        }

        FindFunction::FindFunction( std::list< FunctionType const * > &functions, const TyVarMap &tyVars, bool replaceMode, FindFunctionPredicate predicate )
                : functions( functions ), tyVars( tyVars ), replaceMode( replaceMode ), predicate( predicate ) {
        }

        void FindFunction::handleForall( const Type::ForallList &forall ) {
                for ( const Declaration * td : forall ) {
                        TyVarMap::iterator var = tyVars.find( td->name );
                        if ( var != tyVars.end() ) {
                                tyVars.erase( var->first );
                        } // if
                } // for
        }

        void FindFunction::premutate( FunctionType * functionType ) {
                visit_children = false;
                GuardScope( tyVars );
                handleForall( functionType->get_forall() );
                mutateAll( functionType->get_returnVals(), *visitor );
        }

        Type * FindFunction::postmutate( FunctionType * functionType ) {
                Type *ret = functionType;
                if ( predicate( functionType, tyVars ) ) {
                        functions.push_back( functionType );
                        if ( replaceMode ) {
                                // replace type parameters in function type with void*
                                ret = ScrubTyVars::scrub( functionType->clone(), tyVars );
                        } // if
                } // if
                return ret;
        }

        void FindFunction::premutate( PointerType * pointerType ) {
                GuardScope( tyVars );
                handleForall( pointerType->get_forall() );
        }

namespace {

struct FindFunctionCore :
                public ast::WithGuards,
                public ast::WithShortCircuiting,
                public ast::WithVisitorRef<FindFunctionCore> {
        FindFunctionCore(
                std::vector<ast::ptr<ast::FunctionType>> & functions,
                const TypeVarMap & typeVars, FindFunctionPred predicate,
                bool replaceMode );

        void previsit( ast::FunctionType const * type );
        ast::Type const * postvisit( ast::FunctionType const * type );
        void previsit( ast::PointerType const * type );
private:
        void handleForall( const ast::FunctionType::ForallList & forall );

        std::vector<ast::ptr<ast::FunctionType>> &functions;
        TypeVarMap typeVars;
        FindFunctionPred predicate;
        bool replaceMode;
};

FindFunctionCore::FindFunctionCore(
                std::vector<ast::ptr<ast::FunctionType>> & functions,
                const TypeVarMap &typeVars, FindFunctionPred predicate,
                bool replaceMode ) :
        functions( functions ), typeVars( typeVars ),
        predicate( predicate ), replaceMode( replaceMode ) {}

void FindFunctionCore::handleForall( const ast::FunctionType::ForallList & forall ) {
        for ( const ast::ptr<ast::TypeInstType> & td : forall ) {
                TypeVarMap::iterator var = typeVars.find( *td );
                if ( var != typeVars.end() ) {
                        typeVars.erase( var->first );
                } // if
        } // for
}

void FindFunctionCore::previsit( ast::FunctionType const * type ) {
        visit_children = false;
        GuardScope( typeVars );
        handleForall( type->forall );
        //ast::accept_all( type->returns, *visitor );
        // This might have to become ast::mutate_each with return.
        ast::accept_each( type->returns, *visitor );
}

ast::Type const * FindFunctionCore::postvisit( ast::FunctionType const * type ) {
        ast::Type const * ret = type;
        if ( predicate( type, typeVars ) ) {
                functions.push_back( type );
                if ( replaceMode ) {
                        // replace type parameters in function type with void*
                        ret = scrubTypeVars( ast::deepCopy( type ), typeVars );
                } // if
        } // if
        return ret;
}

void FindFunctionCore::previsit( ast::PointerType const * /*type*/ ) {
        GuardScope( typeVars );
        //handleForall( type->forall );
}

} // namespace

void findFunction( const ast::Type * type,
                std::vector<ast::ptr<ast::FunctionType>> & functions,
                const TypeVarMap & typeVars, FindFunctionPred predicate ) {
        ast::Pass<FindFunctionCore> pass( functions, typeVars, predicate, false );
        type->accept( pass );
        //(void)type;
        //(void)functions;
        //(void)typeVars;
        //(void)predicate;
}

const ast::Type * findAndReplaceFunction( const ast::Type * type,
                std::vector<ast::ptr<ast::FunctionType>> & functions,
                const TypeVarMap & typeVars, FindFunctionPred predicate ) {
        ast::Pass<FindFunctionCore> pass( functions, typeVars, predicate, true );
        return type->accept( pass );
        //(void)functions;
        //(void)typeVars;
        //(void)predicate;
        //return type;
}

} // namespace GenPoly

// Local Variables: //
// tab-width: 4 //
// mode: c++ //
// compile-command: "make install" //
// End: //